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# = Line Interpolation
# This example show the 7 types of interpolation available for lines:
# * linear
# * step-before
# * step-after
# * polar
# * polar-reverse
# * basis
# * cardinal
#
# See also "Area Interpolation":area_interpolation.html
$:.unshift(File.dirname(__FILE__)+"/../../lib")
require 'rubyvis'
data = pv.range(0, 10, 1).map {|x|
OpenStruct.new({:x=> x, :y=> Math.sin(x) + 2+rand()*0.2})
}
p_w=200
p_h=150
#p data
w = 20+p_w*2
h = 20+p_h*4
x = pv.Scale.linear(data, lambda {|d| d.x}).range(0, p_w-30)
y = pv.Scale.linear(data, lambda {|d| d.y}).range(0, p_h-20);
interpolations=["linear","step-before","step-after","polar","polar-reverse", "basis", "cardinal"]
#/* The root panel. */
vis = pv.Panel.new()
.width(w)
.height(h)
.bottom(20)
.left(20)
.right(10)
.top(5)
interpolations.each_with_index do |inter,i|
n=i%2
m=(i/2).floor
panel=vis.add(Rubyvis::Panel).
left(n*(p_w+10)).
top(m*(p_h+10)).
width(p_w).
height(p_h)
panel.anchor('top').add(Rubyvis::Label).text(inter)
panel.add(Rubyvis::Line).data(data).
line_width(2).
left(lambda {|d| x.scale(d.x)}).
bottom(lambda {|d| y.scale(d.y)}).
interpolate(inter)
end
vis.render();
puts vis.to_svg
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